Can someone ID this engine conversion?

["The Ken Pearce" <ken__pearce@hotmail.com>]

http://titan.cc.wwu.edu/~pearceke/name_this_engine.jpg

This picture is from Shasta 2001 and I'm trying to remember what engine this 
is.  And is this person on the list?   I'm getting ready to pull my '68 U20 
and am toying with the idea of a conversion.

Cheers,

Ken Pearce
68-2000
B'ham WA